public void CorrectRequestForGetAllByTag() { var factory = Substitute.For <IConnection>(); var client = new ImagesClient(factory); client.GetAllByTag("mytag"); var parameters = Arg.Is <List <Parameter> >(list => (string)list[0].Name == "tag_name" && (string)list[0].Value == "mytag"); factory.Received().GetPaginated <Image>("images", parameters, "images"); }